Is CVE-2021-22871 in the CISA KEV catalog?

No. CVE-2021-22871 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22871?

CVE-2021-22871 has a CVSS v3 base score of 4.8 (MEDIUM).

What is the EPSS score for CVE-2021-22871?

CVE-2021-22871 has an EPSS score of 2.12% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22871?

Upgrade revive adserver to 5.1.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-22871

MEDIUMEPSS 80th pctl

4.8

CVSS v3

NVD

Description

Revive Adserver before 5.1.0 permits any user with a manager account to store possibly malicious content in the URL website property, which is then displayed unsanitized in the affiliate-preview.php tag generation screen, leading to a persistent cross-site scripting (XSS) vulnerability.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

revive adserverNVD

Affected:< 5.1.0Fixed in:5.1.0CVE-2021-22871derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

2.12%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch2

Exploit1

hackerone.com

Vendor Advisory1

revive-adserver.com

Third-Party Advisory2

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.